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![combien de metres dans un kilometre combien de metres dans un kilometre](https://www.calculateur.com/images/tableau-de-conversion.jpg)
There are a multitude of sources on this for the modern world. km, one needs to simply multiply the answers by 100 to get your final answer. The second definition measures output per area, and there are a myriad definitions, but the most common in modern times is yield in kg per hectare. The first is a ratio of seed to harvest, for instance 20:1 would mean that for every grain planted, you get 20 grains of harvest. This could easily be a whole essay.įor now, I'll restrict myself to modern era practices, since they range from essentially medieval tech to the most modern methods, so a cross-section through space is, in a sense, also one through time in this case.Ĭrop yield varies a lot by crop, and is defined in two ways. For instance, do you eat the cereal or do you feed it to livestock, and then eat the livestock? Or perhaps you choose to distill your cereal and make bourbon. Moreover, there are many ways of transforming those crop calories into foodstuffs. These will dramatically affect what you get from given area. The question is way too broad, since there are many crops, land types and soil fertility levels, climate zones, technological levels, amounts of labor and capital that is available. Genetic engineering might be able to increase this even further, but this is about the right order of magnitude.
![combien de metres dans un kilometre combien de metres dans un kilometre](https://images.ladepeche.fr/api/v1/images/view/5c1909443e45460bd7455886/large/image.jpg)
Our cube, using aeroponics, would produce 98,420,000,000 kcal/km 3/day and could feed a population of 49,210,000 people. A sweet potato is about a meter tall, so we can grow 1000 layers of them in a 1km 3 densely packed fusion powered green house. In this case, a better measure might be kcal/km 3/day.
#COMBIEN DE METRES DANS UN KILOMETRE GENERATOR#
Of course, if we can fire up a fusion generator to illuminate our crops with artificial, light, we can stack layers of crops on top of each other. So far, all of this has been constrained by sunlight: we can only grow one layer of crops if our crops get energy from the sun. Assuming that, with further refinement, the upper end of this can be realized, we should be able to increase our sweet potatoes to 98,420,000 kcal/km 2/day, which can feed a total of 49,210 people on a 2000 kcal/day diet of sweet potatoes. This source found that, with the correct nutrient solutions, they were able to increase yield over conventional hydroponics by between 50% and 270%. In an aeroponic farm, nutrient rich water is vaporized to form a mist that is then sprayed onto the roots of crops. This increases our base of 70,000 kcal/ha/day to 266,000 kcal/ha/day, which will feed 13,300 people per square kilometer.Ĭurrently, individuals are researching an even better way of growing crops: aeroponics. In addition, we won't have to let our fields lie fallow, since we no longer have any soil that we're growing plants in. According to this source, hydroponics will increase our raw yield by around 280%. The first thing we can do is to employ hydroponics. Now let's see how we can increase that yield.
![combien de metres dans un kilometre combien de metres dans un kilometre](https://images.sudouest.fr/2016/10/18/5807550666a4bd426f202535/golden/l-escalier-qui-monte.jpg)
This corresponds to 4,700,000 kcal/km 2/day, which can feed 2350 people on a 2000 kcal/day diet of pure sweet potatoes.
![combien de metres dans un kilometre combien de metres dans un kilometre](https://mrcircuspoliticus.files.wordpress.com/2020/03/eternuement-homme.jpg)
This is achievable with fairly primitive technology. (with potatoes providing 54,000 which is roughly in line with what ArtOfCode calculated.) This involves fairly intensive farming, so we'll need to let the land lie fallow for about a third of the time, reducing our long-term average to around 47,000 kcal/ha/day for our most dense food crop (in terms of kcal.ha/day). See all conversions for meters here.According to this source, the highest caloric density food is sweet potatoes, which provide 70,000 kcal/ha/day. This is approximately the distance from floor to hip bone on the average barefoot man. Now, it is defined by the International Bureau of Weights and Measures as the distance travelled by light in absolute vacuum in 1/299,792,458 of a second. Historically, the metre was defined by the French Academy of Sciences as 1/10,000,000 of the distance from the equator to the north pole through Paris. It is the basic unit of length in the metric system and in the International System of Units (SI), used around the world for general and scientific purposes. The metre, or meter (US), is a measure of length.
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